Abigail Hernandez was last seen leaving Kennett High School in Conway, N.H., around 2:30 p.m. on Wednesday.

The Union Leader newspaper in New Hampshire is reporting that investigators say a call was made from her phone several hours after she was last seen, although the exact location from which the call was made is unknown.

Abigail's 15th birthday was Saturday. On that day, her mother went before TV cameras with a plea to Abigail's friends to provide any information that might help to find her.